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Talc-Pyrophyllite group [abbr. Tlc-Prl ]
[ A
6+
][(OH)
2
|(Si
2
O
5
)
2
]
Class: No interlayer < 2:1 layer < Planar hydrous <
Phyllosilicate subclass
<
Silicate class
Class:
Phyllosilicate
-
Hydroxide
System: Monoclinic, Triclinic
Trioctahedral
[ Fe
2+
3
]: Minnesotaite
[ Mg
2+
3
]:
Talc
[ Ni
2+
3
]: Willemseite
Dioctahedral
[ Fe
3+
2
]: Ferripyrophyllite
[ Al
3+
2
]:
Pyrophyllite
[ (Na,Al)
2
]Brinrobertsite